Sewing machine



FIG. 1 is a prespective view of a sewing machine showing my new design.

FIG. 2 is a left side view thereof.

FIG. 3 is a right side view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a front view thereof.

FIG. 6 is a back view thereof.

FIG. 7 is a bottom view thereof. 

The ornamental design for a sewing machine, as shown and described. 